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(x+50)+(4x+20)+(3x+50)=360
We move all terms to the left:
(x+50)+(4x+20)+(3x+50)-(360)=0
We get rid of parentheses
x+4x+3x+50+20+50-360=0
We add all the numbers together, and all the variables
8x-240=0
We move all terms containing x to the left, all other terms to the right
8x=240
x=240/8
x=30
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